#!/bin/bash
#
# getrss
#
# A command line rss reader. 
#
# v1.1
# 
# Known Bugs:
# 
# An RSS URL that includes an equal sign will not get rendered correctly 
# if stored as a bookmark, as I'm currently using that to parse the config file
#
# Even though I've tried to eliminate this through terse regular expressions, 
# some exotic RSS feeds may not render correctly if they use obscure or 
# elaborate markup methods. 
#
# Soon to be added is a way to list your bookmarks. Until then, you can use 
# this command: cat ~/.getrssrc  | grep ARRTITLE | awk -F= '{print $2}'
#
# There is currently no way to delete bookmarks automatically. If you do it by 
# hand, then you must renumber all the subsequent bookmarks, or you will have 
# numbering issues when you add a new bookmark, because it counts the number of 
# them it finds, rather than incrementing the last one in the list.  This 
# is trivial to fix, I just haven't done it yet. 
#
# Please let me know of any bugs you find at the address below. 
# Many thanks, 
#
# Matt Simmons
# bandman@gmail.com
# 7/20/06

if [ "$1" == "" ] ; then 
   echo "Usage: $0 [OPTION] [URL] [LINK NUMBER | <-a>] <title>"
   echo "Display an RSS feed live from the internet"
   echo ""
   echo "Options:"
   echo "  -<bookmark>		Display a bookmarked feed"
   echo "			Note the need to prefix the bookmark with a -"
   echo ""
   echo "[URL]			The uniform resource locator"
   echo "An example is http://www.thinkgeek.com/thinkgeek.rss"
   echo "" 
   echo "[LINK NUMBER]		Browse to the given link"
   echo "			in Firefox, or your default browser"
   echo "<-a>			Tells getrss that you want to add [URL] "
   echo "			to your bookmarks. "
   echo "<title>		Is the title you want to assign your bookmark"
   echo "			Notice that you must yuse <title> if you use <-a>"


   echo ""
   exit
fi



if [ "$2" == "-a" ] ; then 
   if [ "$3" == "" ] ; then 
      echo "Error parsing command line."
      echo "Please run without options  for usage"
      exit
   fi
   ADDBOOKMARK=$3
   ADDLINK=$1
fi

if [ "`echo ${1:0:1}`" == "-" ] ; then 
   BOOKMARK=`echo ${1:1}`
fi

FEEDURL=$1

RETURNLINKS=5

BROWSER=/usr/local/bin/firefox


CONFIGFILE=~/.getrssrc

if [ "$2" != "-a" ] ; then 
   BROWSETO=$2
fi


# The following block allows listing of bookmarks.
# Contributed by Amy Ginter (wallmalker1@gmail.com)
if [ "$1" == "-l" ] ; then    
   echo "Existing Bookmarks:"
   cat $CONFIGFILE | grep ARRTITLE | cut -d\= -f2 | sed 's/^/ -/g'   
   exit 
fi


TMPFILE=/tmp/tmprss.`date +%s`

####################################################

function createConfig() { 
touch "$CONFIGFILE"
echo "
# config file for getrss
# Comments must start on the beginning of the line with the hash symbol
# Do not put comments after config statements

# The number of RSS links you want returned. 
RETURNLINKS=5

# Full path to the browser of your choice
BROWSER=/usr/local/bin/firefox

ARRLINK[1]=http://earthquake.usgs.gov/recenteqsww/catalogs/eqs7day-M2.5.xml
ARRTITLE[1]=usgs
ARRLINK[2]=http://www.fark.com/fark.rss
ARRTITLE[2]=fark
ARRLINK[3]=http://rss.slashdot.org/Slashdot/slashdot
ARRTITLE[3]=slashdot
ARRTITLE[4]=thinkgeek
ARRLINK[4]=http://www.thinkgeek.com/thinkgeek.rss

" > $CONFIGFILE
} 

###############

function parseConfig() { 
if [ -e $CONFIGFILE ] ; then 
   TMPCFG="/tmp/tmpcfg.`date +%s`"
   cat $CONFIGFILE | grep -v ^$ | grep -v \^\# | sed 's/^[ ]*//g' | sed 's/[ ]*=[ ]*/=/g' > $TMPCFG
   LINES=`cat $TMPCFG | wc -l`
   THISLINE=1
   
   while [ $THISLINE -le $LINES ] ; do 
      # Magic
      eval `cat $TMPCFG | head -n $THISLINE | tail -n 1`
      let THISLINE=THISLINE+1
   done 

else
   createConfig
   parseConfig
fi

}

###############

function getTitles () {
   curTitle=1
   numTitles=`cat $TMPFILE | grep "^.*<title>" | wc -l`
   if [ "$numTitles" -gt "$1" ] ; then
      let numTitles=$1+3
   fi
   while [ $curTitle -lt $numTitles ] ; do
      if [ $curTitle -gt 2 ] ; then 
         arrTitles[`expr $curTitle - 2`]="`cat $TMPFILE | sed 's/<title>/\n<title>/g' | sed 's/<\/title>/<\/title>\n/g' | grep "^.*<title>" | head -n $curTitle | tail -n 1 | sed 's/<title>//g' | sed 's/<\/title>//g' | lynx --stdin --dump -width=1000`"
      fi 
      let curTitle=curTitle+1
   done

}

###############

function getLinks () {
   curLink=1
   numLinks=`cat $TMPFILE | grep "^.*<link" | wc -l`
   if [ "$numLinks" -gt "$1" ] ; then
      let numLinks=$1+3
   fi
   while [ $curLink -lt $numLinks ] ; do
      if [ $curLink -gt 2 ] ; then 
         #arrLinks[`expr $curLink - 2`]="`cat $TMPFILE |  sed 's/<link>/\n<link>/g' | sed 's/<\/link>/<\/link>\n/g' | grep "^.*<link>" | head -n $curLink | tail -n 1 | sed 's/<link>//g' | sed 's/<\/link>//g'`"
         arrLinks[`expr $curLink - 2`]="`cat $TMPFILE |   grep "<link"  | sed 's/^.*http/http/g' | sed 's/".*$\|<.*$\|].*$//g' | head -n $curLink | tail -n 1 | sed 's/<link>//g' | sed 's/<\/link>//g'`"
      fi
      let curLink=curLink+1
   done
}

###############

function processBookmark () { 

if [ "`cat $CONFIGFILE | grep "=$BOOKMARK$"`" == "" ] ; then
   echo "Error: No bookmark found in $CONFIGFILE"
   rm -f $TMPFILE 2> /dev/null
   exit
fi
ARRAYNUM=`cat $CONFIGFILE | grep $BOOKMARK | cut -d \[ -f 2 | cut -d \] -f 1`
FEEDURL=`cat $CONFIGFILE | grep "ARRLINK\[$ARRAYNUM\]" | awk -F= '{print $2}'`

} 

###############

function addBookmark () { 
 
if [ "`cat $CONFIGFILE | grep "=$ADDBOOKMARK$"`" != "" ] ; then 
   echo "Error: $ADDBOOKMARK already found in $CONFIGFILE"
   rm -f $TMPFILE 2> /dev/null
   exit
fi
NEWID=`cat $CONFIGFILE | grep "ARRLINK\[" | wc -l`
let NEWID=NEWID+1
echo "ARRTITLE[$NEWID]=$ADDBOOKMARK" >> $CONFIGFILE
echo "ARRLINK[$NEWID]=$ADDLINK" >> $CONFIGFILE

} 


##########################################################################################

parseConfig

if [ "$ADDBOOKMARK" != "" ] ; then 
   addBookmark
   rm -f $TMPFILE 2> /dev/null
   exit
fi


if [ "$BOOKMARK" != "" ] ; then 
   processBookmark
fi


wget -O $TMPFILE $FEEDURL 2>/dev/null

TITLE=`cat $TMPFILE | grep "\<title\>" | head -n 1`
DESC=`cat $TMPFILE | grep "\<description\>" | head -n 1 | sed 's/<description>//g' | sed 's/<\/description>//g'`
echo "$TITLE: $DESC" | sed 's/<title>/<b>/g '| lynx --stdin --dump

getTitles $RETURNLINKS
getLinks $RETURNLINKS

let RETURNLINKS=RETURNLINKS+1


if [ $BROWSETO ] ; then 
   echo "Going to: ${arrLinks[$BROWSETO]}"
   $BROWSER "${arrLinks[$BROWSETO]}"
   echo ""
   rm -f $TMPFILE 2> /dev/null
   exit
fi

curLink=1
while [ $curLink -lt $RETURNLINKS ] ; do 
   echo "$curLink. ${arrTitles[$curLink]}" | lynx --stdin --dump | grep -v "^$"
   let curLink=curLink+1
done

echo ""
rm -f $TMPFILE